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عمومی::
بند ناف
These infants are more likely to experience arterial hypox- emia and acidosis during delivery because of umbilical cord compression.
Prolapse of the umbilical cord occurs with increased frequency in breech presentations and is presumed to reflect failure of the presenting part to fill the lower uterine segment.
In the case of breech presentation, vaginal delivery may be complicated by umbilical cord prolapse or fetal head entrap- ment, which necessitates emergency anesthesia for cesarean or instrumented vaginal delivery.
Variable decelerations are thought to be caused by umbilical cord compression.
For example, with clamping of the umbilical cord at birth, systemic vascular resistance increases, left atrial pressure increases, and flow through the foramen ovale ceases.
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